题目内容
如图甲所示,静止在光滑水平面上的长木板B(长木板足够长)的上面放着小物块A,某时刻,B受到水平向右的外力F作用,F随时间t变化规律如图乙所示,即F=kt,其中k为已知常数。若物体之间的滑动摩擦力f的大小等于最大静摩擦力,且A、B的质量相等,则下列图中可以定性地描述物块A的v-t图像的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025129192008.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025129351179.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025129519684.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025129192008.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025129351179.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025129519684.jpg)
B
试题分析:当两者相对静止时:选AB整体为研究对象,AB整体具有共同的最大加速度,有牛顿第二定律 得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512982649.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512997590.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002513013682.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002513029514.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002513044580.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002513060674.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002513044580.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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